JP2017132891A - Nonaqueous inkjet composition and inkjet recording method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nonaqueous inkjet composition that makes it possible to obtain a recorded matter having excellent chroma and also has excellent storage stability.SOLUTION: A nonaqueous inkjet composition comprises a pigment comprising a diketopyrrolopyrrole pigment, an organic solvent, and an inorganic metal. The organic solvent comprises a glycol ether. The inorganic metal comprises at least one of an alkali metal and an alkaline earth metal. A content of a first inorganic metal, out of the alkali metal and the alkaline earth metal, with the highest content in the nonaqueous inkjet composition, is 100 mass ppm or less with respect to the total amount of the nonaqueous inkjet composition.SELECTED DRAWING: None

Description

  The present invention relates to a non-aqueous ink jet composition and an ink jet recording method.

  The ink jet recording method is capable of recording high-definition images with a relatively simple device, and has been rapidly developed in various fields. Among them, various studies have been made on obtaining a more stable and high-quality recorded matter.

  For example, Patent Document 1 discloses an oily pigment ink composition containing at least a quinacridone pigment, a polymer compound, and an organic solvent for the purpose of providing an oily pigment ink composition having excellent storage stability. An oil pigment ink composition is disclosed in which the total concentration of monovalent cations in the aqueous phase is 100 ppm or less when ions in the oil pigment ink composition are phase-shifted to pure water.

JP 2010-150314 A

  However, when the oil-based pigment ink composition described in Patent Document 1 is used, it is not possible to obtain a recorded matter with excellent saturation although it has excellent storage stability.

  Accordingly, the present invention has been made to solve at least a part of the above-described problems, and provides a non-aqueous inkjet composition having excellent chroma and excellent storage stability of the obtained recorded matter. The purpose is to do.

  As a result of intensive studies to solve the above-described problems of the prior art, the present inventors have at least a pigment containing a diketopyrrolopyrrole pigment and a predetermined organic solvent, and the content of a specific inorganic metal is within a predetermined range. The present inventors have found that by using the non-aqueous ink jet composition in the above, it is possible to obtain a recorded material having excellent storage stability and excellent chroma, and the present invention has been completed.

That is, the present invention is a non-aqueous inkjet composition comprising a pigment containing a diketopyrrolopyrrole pigment, an organic solvent, and an inorganic metal, wherein the organic solvent contains glycol ethers, The inorganic metal contains at least one of an alkali metal and an alkaline earth metal, and contains the first inorganic metal having the highest content in the non-aqueous inkjet composition among the alkali metal and the alkaline earth metal. It is a non-aqueous inkjet composition whose quantity is 100 mass ppm or less with respect to the total amount of the said non-aqueous inkjet composition.
The reason why such a non-aqueous ink jet composition can solve the problems of the present invention is considered as follows. However, the factor is not limited to this. That is, in the conventional non-aqueous composition, simply using a pigment containing a diketopyrrolopyrrole pigment causes aggregation unevenness in the obtained recorded matter, so that the saturation of the recorded matter is sufficient. It is not excellent. Although it is possible to suppress the occurrence of uneven aggregation by using glycol ethers as the organic solvent for this problem, the diketopyrrolopyrrole pigment is an inorganic substance that is an impurity compared to other pigments. There are cases where a large amount of metal is mixed, and glycol ethers used as a solvent have a high affinity with water, so that they easily absorb water, and the ink jet composition easily contains moisture. Due to these, insoluble crystalline foreign matters are generated in the composition from the inorganic metal, and excellent storage stability cannot be obtained. On the other hand, the non-aqueous composition according to the present invention includes a pigment containing a diketopyrrolopyrrole pigment and a glycol ether, and the content of the first inorganic metal is 100 ppm by mass or less. The recorded material has excellent saturation and storage stability.

Further, in the non-aqueous inkjet composition according to the present invention, the second inorganic metal having the second highest content after the first inorganic metal in the non-aqueous inkjet composition among the alkali metal and the alkaline earth metal. The content is preferably less than 100 ppm by mass with respect to the total amount of the non-aqueous inkjet composition, and the first inorganic metal is preferably at least one of sodium, potassium, and calcium, and the glycol ether The class preferably contains a glycol diether represented by the following formula (1), and preferably contains a glycol monoether represented by the following formula (2).
R ¹ O— (R ³ O) _m —R ² (1)
(In the formula (1), R ¹ and R ² each independently represents an alkyl group having 1 to 7 carbon atoms, R ³ is an alkylene group having 1 to 3 carbon atoms, m is 1-7 Indicates an integer.)
OH— (R ⁵ O) _n —R ⁴ (2)
(In formula (2), R ⁴ represents an alkyl group having 1 to 7 carbon atoms, R ⁵ represents an alkylene group having 1 to 3 carbon atoms, and n represents an integer of 1 to 7)

  Furthermore, in the non-aqueous inkjet composition according to the present invention, the content of the pigment is preferably 1.0% by mass or more and 5.0% by mass or less with respect to the total amount of the non-aqueous inkjet composition, The glycol ether content is preferably 10% by mass or more and 90% by mass or less based on the total amount of the non-aqueous inkjet composition, and the organic solvent preferably further contains a cyclic lactone, and a vinyl chloride resin. Is preferably further included.

  In addition, the ink jet recording method according to the present invention includes a step of recording on a recording medium by the ink jet method using the non-aqueous ink jet composition according to the present invention.

1 is a perspective view schematically illustrating a configuration of a printer according to an embodiment of the present invention.

  Hereinafter, a form for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings as necessary. The following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents. The present invention can be appropriately modified within the scope of the gist. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, positional relationships such as up, down, left and right are based on the positional relationships shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

[Non-aqueous inkjet composition]
The non-aqueous inkjet composition of the present embodiment (hereinafter, also simply referred to as “inkjet composition”, “non-aqueous composition”, “composition”) includes a pigment containing a diketopyrrolopyrrole pigment, an organic solvent, and an inorganic solvent. Including metal. In the non-aqueous inkjet composition, the organic solvent contains glycol ethers, the inorganic metal contains at least one of an alkali metal and an alkaline earth metal, and the alkali metal and the alkaline earth metal. Among the metals, the content of the first inorganic metal having the largest content in the non-aqueous inkjet composition is 100 mass ppm or less with respect to the total amount of the non-aqueous inkjet composition.

  The composition of this embodiment contains a glycol ether together with a pigment containing a diketopyrrolopyrrole pigment, and the content of the first inorganic metal is 100 mass ppm or less, so that the chroma of the recorded matter obtained is obtained. And excellent storage stability. This factor is inferred as follows (however, the factor is not limited to this). The conventional non-aqueous composition is sufficiently excellent in chroma of the recorded matter due to the occurrence of aggregation unevenness in the obtained recorded matter simply by using a pigment containing a diketopyrrolopyrrole pigment. It is not a thing. Although it is possible to suppress the occurrence of uneven aggregation by using glycol ethers as the organic solvent for this problem, the diketopyrrolopyrrole pigment is an inorganic metal that is an impurity compared to other pigments. In addition, the glycol ethers used as a solvent have a high affinity with water and thus easily absorb water, and the ink jet composition easily contains moisture. Due to these, insoluble crystalline foreign matters are generated in the composition from the inorganic metal, and excellent storage stability cannot be obtained. On the other hand, the non-aqueous composition of the present embodiment is obtained by including a pigment containing a diketopyrrolopyrrole pigment and a glycol ether, and the content of the first inorganic metal is 100 mass ppm or less. Excellent chroma and storage stability of recorded material.

  In the present embodiment, “non-aqueous” is a composition in which an organic solvent or the like is a main solvent and water is not a main solvent. Here, the “main solvent” means that the content in the composition is 50% by mass or more with respect to 100% by mass of the composition, preferably 70% by mass or more, More preferably, it is at least mass%. Further, when it contains water, it is preferably a composition in which water is not intentionally added as a main solvent component in the preparation of the composition, and it is preferably a case where water is inevitably contained as an impurity. . From the viewpoint of storage stability, the content of water in the composition is preferably 3.0% by mass or less, more preferably 2.0% by mass or less, and 1.0% by mass with respect to 100% by mass of the composition. The following is more preferable, and 0.5% by mass or less is more preferable. The lower limit of the water content is not particularly limited, and may be below the detection limit or 0.01% by mass.

<Inorganic metal>
The inorganic metal of the present embodiment contains at least one of an alkali metal and an alkaline earth metal. Inorganic metals are included as impurities in various raw materials used for non-aqueous compositions, for example, and are particularly included in pigments. Examples of the inorganic metal include alkali metals such as Li (lithium), Na (sodium), and K (potassium); alkaline earth metals such as Ca (calcium) and Ba (barium); Ag (gold), Mg (Magnesium), Zn (zinc), Fe (iron), Sn (tin), and Zr (zirconium). Here, in the present specification, the “inorganic metal” means a metal element that exists in a state other than the organometallic compound in the non-aqueous composition. Inorganic metals may be present in any form of neutral metals, metal ions and metal salts in non-aqueous compositions, but may be present in the form of metal ions or metal salts, in which case May adversely affect storage stability and ejection stability. By setting it as the composition of this embodiment, such an influence can be reduced and storage stability and discharge stability can be improved. Here, among alkali metals and alkaline earth metals, the metal (seed) with the highest content in the non-aqueous composition is the first inorganic metal, and the metal (seed) with the next highest content is the second inorganic metal. The metal (seed) having the second largest content is called a third inorganic metal. Each of the first inorganic metal, the second inorganic metal, and the third inorganic metal is not limited to one type, and when the contents are substantially the same (difference within 5% by mass), a plurality of types may be used. Good. The metal (seed) with a high content varies depending on the pigment used, the production method thereof, the container in contact with the non-aqueous composition, and the adjustment method of the content of the inorganic metal. For example, diketopyrrolopyrrole pigment is different from other pigments. In comparison, there is a tendency that a large amount of an inorganic metal as an impurity is mixed. It is inferred that a very small amount of water is unavoidably present in non-aqueous compositions, and that when this water comes into contact with inorganic metals, insoluble crystalline foreign matter is produced, which causes deterioration in storage stability. (However, the factor is not limited to this.) In addition, diketopyrrolopyrrole pigments often contain a large amount of inorganic metal, and the storage stability of conventional non-aqueous compositions containing diketopyrrolopyrrole pigments tends to decrease. Moreover, since glycol ethers used as a solvent have high affinity with water and easily absorb water, non-aqueous compositions containing conventional glycol ethers easily contain moisture. Furthermore, in the present embodiment, in order to suppress the generation of foreign matter, when glycol ethers having a high inorganic metal content due to the diketopyrrolopyrrole pigment and having a high affinity with water are used as a solvent, The content of the first inorganic metal is 100 mass ppm or less.

  It is preferable that the first inorganic metal is at least one of sodium, potassium, and calcium from the viewpoint of more reliably achieving the effects of the present invention. For example, when a diketopyrrolopyrrole pigment is used, the first inorganic metal tends to be sodium. In addition, the first inorganic metal tends to be sodium, the second inorganic metal is potassium or calcium, and the first inorganic metal is sodium, the second inorganic metal is potassium, and the third inorganic metal is calcium. There is more. Moreover, it exists in the tendency which shows the effect of this invention more reliably because a 1st inorganic metal is an alkali metal, and it exists in the tendency which shows the effect of this invention more reliably because a 1st inorganic metal is sodium. It is in.

  The content of the first metal is 100 mass ppm or less, preferably 0.1 mass ppm or more and 100 mass ppm or less, more preferably 0.5 mass ppm or more and 70 based on the total amount of the non-aqueous composition. Mass ppm or less, more preferably 1.0 mass ppm or more and 50 mass ppm or less, still more preferably 2.0 mass ppm or more and 30 mass ppm or less, and even more preferably 3.0 mass ppm or more and 10 or less. The mass is ppm or less. When the content of the first metal is 100 mass ppm or less, the non-aqueous composition is excellent in storage stability. When the content of the first metal is 0.1 mass ppm or more, a non-aqueous composition in which generation of mist is suitably reduced can be obtained, and the content of the inorganic metal in the non-aqueous composition can be reduced. Since the purification treatment required for adjustment can be further reduced, the productivity tends to be excellent. Further, when the content of the first metal is 0.1 mass ppm or more, the generation of mist can be suitably reduced, so that the cleanliness of the nozzle plate can be kept good, and as a result There is a tendency that stability can be kept good.

  The content of the second metal is preferably less than 100 mass ppm, more preferably 0.1 mass ppm or more and less than 100 mass ppm, and even more preferably 0.5 mass based on the total amount of the non-aqueous composition. ppm to 70 mass ppm, more preferably 1.0 mass ppm to 50 mass ppm, still more preferably 2.0 mass ppm to 30 mass ppm, and particularly preferably 3.0 mass. It is ppm or more and 10 mass ppm or less. When the content of the second metal is less than 100 ppm by mass, the non-aqueous composition is more excellent in storage stability. When the content of the second metal is 0.1 mass ppm or more, the chroma of the recorded matter obtained is excellent and the productivity of the non-aqueous composition is excellent. Further, when the content of the second metal is 0.1 mass ppm or more, a better chroma is obtained due to the improved wettability of the recorded matter obtained from the non-aqueous composition. It tends to be.

  The content of the third metal is preferably less than 100 mass ppm, more preferably 0.1 mass ppm or more and less than 100 mass ppm, and even more preferably 0.5 mass based on the total amount of the non-aqueous composition. ppm to 70 mass ppm, more preferably 1.0 mass ppm to 50 mass ppm, still more preferably 2.0 mass ppm to 30 mass ppm, and particularly preferably 3.0 mass. It is ppm or more and 10 mass ppm or less. When the content of the third metal is less than 100 ppm by mass, the non-aqueous composition is more excellent in storage stability. When the content of the third metal is 0.1 mass ppm or more, the chroma of the recorded matter obtained is excellent and the manufacturability of the non-aqueous composition is excellent. Further, when the content of the third metal is 0.1 mass ppm or more, a better chroma is obtained due to the improved wettability of the recorded matter obtained from the non-aqueous composition. It tends to be.

  Examples of the method for adjusting the content of the inorganic metal in the composition include, for example, a method for purifying the pigment and adjusting the content of the inorganic metal contained in the pigment, a method for selecting the material of the container in contact with the composition, and a composition The method of refine | purifying a thing is mentioned. Content of an inorganic metal can be measured by the method described in the Example mentioned later.

  The non-aqueous inkjet composition of this embodiment includes a pigment and an organic solvent described later. The composition containing a solvent is roughly classified into a real solvent (high organic solvent) composition and an eco solvent (low organic solvent) composition. Eco solvent composition is a low odor and environmentally friendly composition, and does not fall under the organic solvent stipulated by the Industrial Safety and Health Act. Is not applicable, or organic solvents that are not subject to the obligation of local exhaust ventilation are used in indoor workplaces with installation environments stipulated by the Fire Service Act. As the solvent-based composition of the present embodiment, any of an organic solvent that can be used for a real solvent composition and an organic solvent that can be used for an eco solvent composition can be used. It is preferable to include an organic solvent.

  In the present embodiment, the “inkjet composition” can be used for various applications as a composition used by being ejected by an inkjet method, and the application is not limited. Specifically, the use is for ink. Hereinafter, the case where the composition of the present embodiment is used as an ink composition for ink jet recording (hereinafter, also simply referred to as “ink composition”), which is one embodiment of the ink jet composition, will be described in more detail. The composition of the embodiment is not limited to this.

<Pigment>
The pigment of the present embodiment is not particularly limited as long as it contains a diketopyrrolopyrrole pigment, and may be only a diketopyrrolopyrrole pigment, or a pigment other than a diketopyrrolopyrrole pigment and a diketopyrrolopyrrole pigment (hereinafter, It may also be a mixture with “other pigments”.

  The diketopyrrolopyrrole pigment is not particularly limited as long as it has a diketopyrrolopyrrole skeleton. The diketopyrrolopyrrole skeleton may have a substituent such as an alkyl group on the diketopyrrolopyrrole skeleton. The group may be all hydrogen atoms). Specific examples of the diketopyrrolopyrrole pigment are not particularly limited. I. Pigment red 254, C.I. I. Pigment red 255, C.I. I. Pigment red 264, C.I. I. Pigment red 270, and C.I. I. Red organic pigments such as CI Pigment Red 272; I. Pigment orange 71, C.I. I. Pigment orange 73, and C.I. I. Examples thereof include orange-based organic pigments such as CI Pigment Orange 81. Among these, C.I. from the viewpoint of obtaining a recorded matter with better saturation. I. Pigment red 254, C.I. I. Pigment red 255, and C.I. I. Pigment Red 264, a red organic pigment, is preferable. I. Pigment red 254, C.I. I. Pigment Red 255 is more preferable, and C.I. I. Pigment Red 254 is more preferable. These diketopyrrolopyrrole pigments may be used alone or in combination of two or more.

The diketopyrrolopyrrole pigment is preferably a diketopyrrolopyrrole red pigment. The diketopyrrolopyrrole red pigment exhibits red color and has a diketopyrrolopyrrole skeleton, and examples thereof include the diketopyrrolopyrrole red pigment which is the red pigment described above. Here, “presenting red” means a CIE table obtained by measuring the color of a recorded material coated with an inkjet composition so as to cover the entire surface of a white recording medium, using Spectrolino (manufactured by Gretag Macbeth). In the L ^* C ^* h color space in the color system, h is −30 ° to 45 °, h is preferably −30 ° to 32 °, and h is −30 ° to 30 °. More preferably, h is more preferably −30 ° to 25 °.

  The content of the diketopyrrolopyrrole pigment is not particularly limited, but is 30% by mass or more and 100% by mass or less, 50% by mass or more and 100% by mass or less, and 70% by mass with respect to the total amount of pigment (100% by mass). It is not less than 100% by mass. By using a composition in which the content of the diketopyrrolopyrrole pigment is in such a range, the saturation tends to be more excellent.

  Other pigments are not particularly limited as long as they are pigments other than diketopyrrolopyrrole pigments. For example, pigments such as inorganic pigments and organic pigments that are usually used in conventional non-aqueous ink compositions can be used. . These other pigments may be used alone or in combination of two or more.

  Examples of the organic pigment include, but are not limited to, azo pigments (for example, azo lakes, insoluble azo pigments, condensed azo pigments, chelate azo pigments), polycyclic pigments (phthalocyanine pigments, perylene and perylene pigments, anthraquinone pigments, quinacridone pigments, Dioxazine pigments, thioindigo pigments, isoindolinone pigments, quinophthalone pigments), dye lakes (eg, basic dye type lakes, acid dye type lakes), nitro pigments, nitroso pigments, aniline black, and daylight fluorescent pigments .

  Although it does not specifically limit as an inorganic pigment, For example, carbon black, titanium dioxide, a silica, and an alumina are mentioned.

  In addition, as other pigments, red organic pigments other than diketopyrrolopyrrole pigments (hereinafter also referred to as “other red organic pigments”) and orange organic pigments other than diketopyrrolopyrrole pigments (hereinafter referred to as “other red pigments”) , "Other orange organic pigments") is also preferable from the viewpoint of ejection stability and abrasion resistance.

  Other red organic pigments are not particularly limited. I. Pigment red 2, C.I. I. Pigment red 3, C.I. I. Pigment red 5, C.I. I. Pigment red 6, C.I. I. Pigment red 7, C.I. I. Pigment red 15, C.I. I. Pigment red 16, C.I. I. Pigment red 48: 1, C.I. I. Pigment red 53: 1, C.I. I. Pigment red 57: 1, C.I. I. Pigment red 122, C.I. I. Pigment red 123, C.I. I. Pigment red 139, C.I. I. Pigment red 144, C.I. I. Pigment red 149, C.I. I. Pigment red 166, C.I. I. Pigment red 170, C.I. I. Pigment red 177, C.I. I. Pigment red 178, C.I. I. Pigment red 179, C.I. I. Pigment red 194, C.I. I. Pigment red 209, C.I. I. Pigment red 222, and C.I. I. Pigment red 224.

  Other orange organic pigments are not particularly limited, and examples thereof include C.I. I. Pigment orange 31, C.I. I. Pigment orange 43, and C.I. I. Pigment orange 64.

  The content of the pigment is preferably 0.5% by mass or more and 10% by mass or less, more preferably 1.0% by mass or more and 7.0% by mass or less, with respect to the total amount (100% by mass) of the composition. More preferably, it is 2.5 mass% or more and 3.0 mass% or less. When the pigment content is 0.5% by mass or more, the chroma of the obtained recorded product tends to be more excellent, and when the pigment content is 10% by mass or less, It tends to be more excellent in storage stability and ejection stability.

<Organic solvent>
The organic solvent of this embodiment will not be specifically limited if it contains glycol ethers. By containing glycol ethers, the occurrence of uneven aggregation can be suppressed, and when the diketopyrrolopyrrole pigment is used, the saturation can be further improved. By using glycol ethers as the organic solvent, it is possible to suppress the occurrence of uneven aggregation.

When the glycol ethers contain a glycol diether represented by the following formula (1) (hereinafter, also referred to as “specific glycol diether”), a recording material having superior abrasion resistance can be obtained. From the viewpoint of improving the dispersion stability of the ketopyrrolopyrrole pigment, it is preferable to contain a glycol monoether represented by the following formula (2) (hereinafter also referred to as “specific glycol monoether”). It is preferable from the viewpoint of making the wettability of the ink containing the ketopyrrolopyrrole pigment better, and obtaining a recorded matter with better chroma, and more preferably containing the specific glycol diether and the specific glycol monoether at the same time.
R ¹ O— (R ³ O) _m —R ² (1)
In formula (1), R ¹ and R ² each independently represents an alkyl group having 1 to 7 carbon atoms, R ³ represents an alkylene group having 1 to 3 carbon atoms, and m represents 1 to 7 carbon atoms. Indicates an integer.
OH— (R ⁵ O) _n —R ⁴ (2)
In formula (2), R ⁴ represents an alkyl group having 1 to 7 carbon atoms, R ⁵ represents an alkylene group having 1 to 3 carbon atoms, and n represents an integer of 1 to 7.

  Specific examples of the specific glycol diether include, but are not limited to, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, Triethylene glycol diethyl ether, triethylene glycol dibutyl ether, tetraethylene glycol dimethyl ether, tetraethylene glycol diethyl ether, tetraethylene glycol dibutyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, dipropylene glycol Dimethyl ether, and, dipropylene glycol diethyl ether. Among these, diethylene glycol ethyl methyl ether, diethylene glycol diethyl ether, and tetraethylene glycol dimethyl ether are preferable, and diethylene glycol ethyl methyl ether is more preferable. By containing such a preferred specific glycol diether, the recorded matter obtained has a better rub resistance and tends to obtain better ejection stability. Specific glycol diether may be used individually by 1 type, or may use 2 or more types together.

  The content of the specific glycol diether is preferably 5.0% by mass or more and 90% by mass or less, more preferably 20% by mass or more and 80% by mass or less, with respect to the total amount (100% by mass) of the composition. More preferably, it is 30 mass% or more and 70 mass% or less. When the content of the specific glycol diether is in such a range, it tends to be more excellent in the chroma and storage stability of the obtained recorded matter. Moreover, it tends to be difficult for moisture to be mixed into the non-aqueous composition. In addition, content of the specific glycol diether in a composition here is content containing also the specific glycol diether used for the dispersion liquid, for example.

  Specific examples of the specific glycol monoether are not particularly limited, but ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono n-propyl ether, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, ethylene glycol monohexyl ether , Ethylene glycol monophenyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, tetraethylene glycol monoether Ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether. Among these, ethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monoethyl ether, and dipropylene glycol monoethyl ether are preferable, and triethylene glycol monobutyl ether is more preferable. By containing such a preferred specific glycol monoether, the recorded matter obtained has a better rubbing resistance and tends to obtain better ejection stability. Specific glycol monoether may be used individually by 1 type, or may use 2 or more types together.

  The content of the specific glycol monoether is preferably 3.0% by mass to 80% by mass and more preferably 5.0% by mass to 30% by mass with respect to the total amount (100% by mass) of the composition. More preferably, it is 7.0 mass% or more and 15 mass% or less. When the content of the specific glycol monoether is in such a range, the recorded matter obtained tends to be more excellent in chroma and storage stability. Moreover, it tends to be difficult for moisture to be mixed into the non-aqueous composition. In addition, content of the specific glycol monoether in a composition here is content which also contains the specific glycol monoether used for the dispersion liquid, for example.

  The content of glycol ethers is preferably 5.0% by mass or more and 95% by mass or less, more preferably 10% by mass or more and 90% by mass or less, with respect to the total amount (100% by mass) of the composition. More preferably, it is 20 mass% or more and 85 mass% or less. When the content of the glycol ether is in such a range, the recorded matter obtained tends to be more excellent in chroma and ejection stability. Moreover, it tends to be difficult for moisture to be mixed into the non-aqueous composition. In addition, content of the glycol ethers in a composition here is content containing the glycol ethers used for the dispersion liquid, for example.

  The organic solvent is a glycol diether other than the specific glycol diether and the specific glycol monoether (hereinafter also referred to as “other glycol diether”) and / or glycol monoether (hereinafter also referred to as “other glycol monoether”). .) May be contained. Examples of other glycol diethers include heptaethylene glycol dimethyl ether, and examples of other glycol monoethers include heptaethylene glycol monomethyl ether.

  When the organic solvent further contains a cyclic lactone, there is a tendency that a recorded matter having better abrasion resistance and storage stability can be obtained. The cyclic lactone is not particularly limited as long as it is a compound having a cyclic structure by an ester bond. For example, γ-lactone having a 5-membered ring structure, δ-lactone having a 6-membered ring structure, and ε- Examples include lactones. Specific examples of cyclic lactones are not particularly limited, but γ-butyrolactone, γ-valerolactone, γ-hexalactone, γ-heptalactone, γ-octalactone, γ-nonalactone, γ-decalactone, and γ-undeca. Examples include lactone, δ-valerolactone, δ-hexalactone, δ-heptalactone, δ-octalactone, δ-nonalactone, δ-decalactone, δ-undecalactone, and ε-caprolactam. Among these, γ-lactone having a 5-membered ring structure and δ-lactone having a 6-membered ring structure are preferable, γ-butyrolactone, γ-valerolactone, and δ-valerolactone are more preferable, and γ-butyrolactone is further preferable. By containing such cyclic lactones, the abrasion resistance tends to be further improved. Cyclic lactones may be used alone or in combination of two or more.

  The content of the cyclic lactone is preferably 1.0% by mass or more and 50% by mass or less, more preferably 3.0% by mass or more and 40% by mass or less, with respect to the total amount (100% by mass) of the composition. More preferably, it is 5.0 mass% or more and 30 mass% or less. When the content of the cyclic lactone is 1.0% by mass or more, it tends to be excellent in abrasion resistance, and when the content of the cyclic lactone is 50% by mass or less, it tends to be excellent in chroma. It is in. In addition, content of cyclic lactone in the composition here is content which also contains cyclic lactone used for the dispersion liquid, for example.

  The organic solvent other than glycol diether and glycol monoether and cyclic lactone (other organic solvent) is preferably a hydrocarbon solvent, an alcohol solvent, and an ester solvent, more preferably an ester solvent. .

  Although it does not specifically limit as a hydrocarbon-type solvent, For example, aliphatic hydrocarbon (for example, paraffin, isoparaffin), alicyclic hydrocarbon (for example, cyclohexane, cyclooctane, cyclodecane, etc.), and aromatic hydrocarbon (for example, Benzene, toluene, xylene, naphthalene, tetralin, etc.). Commercially available products may be used as such hydrocarbon solvents, such as IP solvent 1016, IP solvent 1620, IP Clean LX (all trade names made by Idemitsu Kosan Co., Ltd.), Isopar G, Isopar L , Isopar H, Isopar M, Exxsol D40, Exxsol D80, Exxsol D100, Exxsol D130, Exxsol D140 (all are trade names manufactured by Exxon), NS Clean 100, NS Clean 110, NS Clean 200, NS Clean 220 and above All are aliphatic hydrocarbon solvents or alicyclics such as JX Nippon Mining & Energy Co., Ltd.), Naphthezol 160, Naphthezol 200, Naphthezol 220 (all are JX Nippon Mining & Energy Co., Ltd.) And aromatic hydrocarbon solvents such as Solvesso 200 (trade name, manufactured by Exxon).

  Although it does not specifically limit as alcohol solvent, For example, methanol, ethanol, isopropanol, 1-propanol, 1-butanol, 2-butanol, 3-pentanol, 2-methyl-1-butanol, 2-methyl-2- Butanol, isoamyl alcohol, 3-methyl-2-butanol, 3-methoxy-3-methyl-1-butanol, 4-methyl-2-pentanol, allyl alcohol, 1-hexanol, 1-heptanol, 2-heptanol, and 3 -Heptanol.

  The ester solvent is not particularly limited. For example, methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, isopentyl acetate, sec-butyl acetate, amyl acetate, methoxybutyl acetate ( 3-methoxybutyl acetate, 3-methoxy-3-methyl-1-butyl acetate), methyl lactate, ethyl lactate, butyl lactate, methyl caprylate, methyl caprate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, Propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, and die Include glycol monobutyl ether acetate. Among these, methoxybutyl acetate, methyl caprylate, and methyl caprate are preferable.

  The total content of any one or more of a hydrocarbon solvent, an alcohol solvent, and an ester solvent as the organic solvent is preferably 30% by mass with respect to the total amount (100% by mass) of the non-aqueous composition. It is 80 mass% or less, More preferably, it is 40 mass% or more and 60 mass% or less, More preferably, it is 45 mass% or more and 55 mass% or less. When the content is within such a range, the chroma and the storage stability of the obtained recorded matter tend to be superior.

  The content of the organic solvent is preferably 35% by mass or more and 95% by mass or less, more preferably 50% by mass or more and 90% by mass or less, and still more preferably with respect to the total amount (100% by mass) of the composition. It is 60 mass% or more and 90 mass% or less. In addition, content of the organic solvent in a composition here is content containing the organic solvent used for the dispersion liquid, for example.

<Resin>
The composition of this embodiment may further contain a resin for the purpose of adjusting the viscosity of the composition. The resin is not particularly limited. For example, fiber resins such as acrylic resin, styrene acrylic resin, rosin modified resin, phenol resin, terpene resin, polyester resin, polyamide resin, epoxy resin, vinyl chloride resin, cellulose acetate butyrate, etc. Resin, and vinyltoluene-α-methylstyrene copolymer resin. Among these, vinyl chloride resin is preferable, and vinyl chloride vinyl acetate copolymer resin is more preferable. By including such a resin, the rub resistance of the obtained recorded matter tends to be further improved. These resins may be used alone or in combination of two or more.

  Although it does not specifically limit as a vinyl chloride resin, For example, the copolymer resin of vinyl chloride and 1 type, or 2 or more types selected from the group which consists of vinyl acetate, vinylidene chloride, an acryl, maleic acid, and vinyl alcohol Is mentioned. Among these, a vinyl chloride vinyl acetate copolymer resin of vinyl chloride and vinyl acetate is preferable, and a vinyl chloride vinyl acetate copolymer resin having a glass transition temperature of 60 ° C. or higher and 80 ° C. or lower is more preferable. The acryl is not particularly limited as long as it is a compound copolymerized with vinyl chloride. For example, methyl acrylate, ethyl acrylate, isopropyl acrylate, acrylic acid-n-butyl, acrylic acid-2-ethylhexyl, etc. Acrylic acid esters: Methacrylic acid esters such as methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, -n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, cyclohexyl methacrylate, and 2-ethylhexyl methacrylate Carboxyl group-containing monomers such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, mono-n-butyl maleate, mono-n-butyl fumarate, mono-n-butyl itaconic acid; (Meth) acrylic acid ester , Amide group-containing monomers, glycidyl group-containing monomers, cyano group-containing monomers, hydroxyl group-containing allyl compounds, tertiary amino group-containing monomer, and alkoxysilyl group-containing monomer and the like. These acrylics can be used individually by 1 type or in combination of 2 or more types.

  The content of the resin is preferably 0.1% by mass or more and 10% by mass or less, more preferably 0.3% by mass or more and 5.0% by mass or less, with respect to the total amount (100% by mass) of the composition. More preferably, it is 0.5 mass% or more and 3.0 mass% or less. A composition having a resin content in such a range tends to be more excellent in abrasion resistance.

  The composition of this embodiment may contain 1 type, or 2 or more types of the arbitrary components which can be used for the conventional non-aqueous inkjet ink composition other than said each component. As such optional components, specifically, coloring materials such as dyes, surfactants, dispersants, penetrants, humectants, solubilizers, viscosity adjusters, pH adjusters, antioxidants, preservatives, Examples include antifungal agents, corrosion inhibitors, and chelating agents and other additives and solvents for capturing metal ions that affect dispersion. Each of these is used alone or in combination of two or more.

[Inkjet recording method]
The ink jet recording method of the present embodiment includes a step of recording on a recording medium by the ink jet method using the above-described non-aqueous composition. Specifically, droplets of the non-aqueous composition are ejected, and the droplets are attached to a recording medium, preferably a low-absorbing recording medium, to record an image.

In the present specification, the “low-absorbency recording medium” refers to a recording medium having a water absorption amount of 10 mL / m ² or less from the start of contact to 30 msec ^1/2 in the Bristow method. It is only necessary that the recording surface has this property. According to this definition, the “low-absorbing recording medium” in the present invention includes a non-absorbing recording medium that does not absorb water at all. This Bristow method is the most popular method for measuring the amount of liquid absorbed in a short time, and is also adopted by the Japan Paper Pulp Technology Association (JAPAN TAPPI). For details of the test method, refer to Standard No. of “JAPAN TAPPI Paper Pulp Test Method 2000”. 51 "Paper and paperboard-Liquid absorbency test method-Bristow method".

  Specific examples of the low-absorbency recording medium include sheets, films, and textile products containing a low-absorbency material. The low-absorbency recording medium is a layer containing a low-absorbency material on the surface of a base material (for example, paper, fiber, leather, plastic, glass, ceramics, metal, etc.). May also be provided. Although it does not specifically limit as a low absorptive material, For example, an olefin resin, ester resin, urethane type resin, acrylic resin, and vinyl chloride type resin are mentioned.

  Among these, as the low-absorbency recording medium, a medium having a recording surface containing a vinyl chloride resin can be preferably used. Specific examples of the vinyl chloride resin include, for example, polyvinyl chloride, vinyl chloride-ethylene copolymer, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl ether copolymer, vinyl chloride-vinylidene chloride copolymer, Examples include vinyl chloride-maleic acid ester copolymers, vinyl chloride- (meth) acrylic acid copolymers, vinyl chloride- (meth) acrylic acid ester copolymers, and vinyl chloride-urethane copolymers. Note that there are no particular restrictions on the various properties such as thickness, shape, color, softening temperature, and hardness of the low-absorbency recording medium.

  By having the above composition, the non-aqueous composition of the present embodiment has an effect of excellent chroma and abrasion resistance, particularly for a low-absorbency recording medium, particularly a recording medium containing a vinyl chloride resin. Can be demonstrated. Therefore, according to the ink jet recording method according to the present embodiment, by attaching droplets of the non-aqueous composition to a low-absorbency recording medium, particularly a recording medium containing a vinyl chloride resin, saturation and An image having further excellent abrasion resistance can be recorded.

  The ink jet recording apparatus used in the ink jet recording method of the present embodiment is not particularly limited, but a drop-on-demand ink jet recording apparatus is preferable. The drop-on-demand ink jet recording apparatus employs a piezoelectric element recording method in which recording is performed using a piezoelectric element disposed in a recording head, and heat generated by a heater of a heating resistance element disposed in the recording head. There are methods that employ a thermal jet recording method in which recording is performed using energy, and any recording method can be employed. Hereinafter, an example of the ink jet recording apparatus of the present embodiment will be described in more detail.

[Inkjet recording apparatus]
A conventionally known ink jet printer can be used for the ink jet recording apparatus of the present embodiment. Examples of the ink jet printer include an ink jet printer as shown in FIG. 1 (hereinafter, also simply referred to as “printer”).

  FIG. 1 is a perspective view illustrating a configuration of a printer 1 according to the present embodiment. As shown in FIG. 1, a printer 1 includes an ink jet recording head 2 and a carriage 4 on which an ink cartridge 3 is detachably mounted, and is disposed below the ink jet recording head (ink jet head) 2 and is to be recorded. A platen 5 to which the medium 6 is conveyed, a carriage moving mechanism 7 for moving the carriage 4 in the medium width direction (main scanning direction S) of the recording medium 6, and a medium feeding mechanism for conveying the recording medium 6 in the medium feeding direction. 8. In addition, the printer 1 has a control unit CONT that controls the operation of the entire printer 1.

  The recording head 2 includes a cavity that discharges the accommodated non-aqueous composition from the nozzle, a discharge driving unit that is provided for each cavity, and applies a driving force for discharging the non-aqueous composition. And a nozzle for discharging the non-aqueous composition to the outside of the head. A plurality of cavities, and ejection drive units and nozzles provided for each cavity may be provided in one head independently of each other. The discharge drive unit uses an electromechanical conversion element such as a piezoelectric element that changes the volume of the cavity by mechanical deformation, or an electrothermal conversion element that generates and discharges bubbles in a non-aqueous composition by generating heat. Can be formed. The printer 1 may be provided with one head or a plurality of heads per one non-aqueous composition.

  The ink cartridge 3 is composed of a plurality of independent cartridges, and the above-described non-aqueous composition is filled in each cartridge. Note that the cartridge filled with the non-aqueous composition does not have to be mounted on the carriage 4 during normal printing, and if it is mounted on the carriage 4 at least when cleaning the flow path of the non-aqueous composition. Good.

  The platen 5 includes a platen heater and is configured to heat the recording medium to a set temperature. The recording head 2 has no built-in heater. However, the temperature of the recording head increases as a result of heating the recording medium, and the temperature of the non-aqueous composition contained in the recording head 2 tends to increase. Although not shown, the printer 1 may include an after heater in the recording medium discharge path downstream of the platen heater.

  The non-aqueous composition of this embodiment described above is ejected from the recording head 2. Here, the temperature of the platen when the non-aqueous composition is discharged from the recording head 2 is preferably 35 ° C. or higher, and more preferably 40 ° C. or higher. Further, the temperature of the platen when the non-aqueous composition is discharged from the recording head 2 is preferably 80 ° C. or less, more preferably 70 ° C. or less, still more preferably 60 ° C. or less, and particularly preferably 50 ° C. or less. It is preferable in that the quality of the recorded matter can be further improved by setting the platen to a temperature within the above range with a platen heater.

  In the present embodiment, it is preferable that the ejection frequency when ejecting from the recording head 2 is 1.0 kHz or more and 200 kHz or less. When the discharge frequency is less than or equal to the above, it is preferable from the viewpoint that the discharge stability is more excellent. A discharge frequency means the discharge frequency of the discharge unit of 1 non-aqueous composition droplet. The discharge frequency is preferably 2.0 kHz or more, more preferably 3.0 kHz or more, still more preferably 5.0 kHz or more, and particularly preferably 10 kHz or more from the viewpoint of further increasing the recording speed. The discharge frequency is preferably 200 kHz or less, more preferably 150 kHz or less, still more preferably 100 kHz or less, and particularly preferably 50 kHz or less, from the viewpoint of further improving discharge stability. Furthermore, the discharge frequency is preferably 20 kHz or less, and more preferably 15 kHz or less, from the viewpoint of further improving the discharge stability while ensuring the recording speed. On the other hand, the discharge frequency is preferably 15 kHz or more, and more preferably 20 kHz or more, from the viewpoint of further improving the recording speed while ensuring the discharge stability.

  As the printer 1 of this embodiment, a so-called on-carriage type printer in which the ink cartridge 3 is mounted on the carriage 4 is illustrated, but the printer 1 is not limited to this. For example, a so-called off-carriage in which an ink container (for example, ink pack, ink cartridge, etc.) filled with a non-aqueous composition is attached to the housing of the printer 1 and supplied to the head 2 via an ink supply tube. It may be a type of printer.

  In the ink jet recording apparatus of the present embodiment, an ink set having a plurality of non-aqueous compositions can be used. The ink set of the present embodiment may have a plurality of non-aqueous inkjet compositions of the present embodiment, and in addition, a non-aqueous composition different from the non-aqueous inkjet composition of the present embodiment (others It may further have a non-aqueous composition). In this case, the ink set may be an ink set having the non-aqueous composition of the present embodiment as magenta ink and the other non-aqueous composition as yellow ink and cyan ink. An ink set having a non-aqueous composition as a red ink and other non-aqueous compositions as a magenta ink, a yellow ink, and a cyan ink may be used. From the viewpoint of more excellent color reproducibility, it is preferable to use the non-aqueous composition of this embodiment as a red ink and to use it together with other non-aqueous compositions, magenta ink, yellow ink, and cyan ink. .

  Hereinafter, the present embodiment will be described more specifically with reference to examples and comparative examples. However, the present embodiment is not limited to the following examples and comparative examples as long as the gist thereof is not exceeded.

The main materials for non-aqueous compositions used in the following examples and comparative examples are as follows.
[For non-aqueous compositions]
[Pigment]
C. I. Pigment Red 254 (PR-254) (trade name Pigment Red 254, manufactured by Tokyo Chemical Industry Co., Ltd.)
C. I. Pigment Red 177 (PR-177) (trade name Pigment Red 177 manufactured by Hangzhou Xcolor Chemical Company)
C. I. Pigment Red 179 (PR-179) (trade name Pigment Red 179, manufactured by Gaoyou Auxiliary Factory)
C. I. Pigment Red 224 (PR-224) (trade name Pigment Red 224, manufactured by Hangzhou Xcolor Chemical Company)
〔Organic solvent〕
Diethylene glycol methyl ethyl ether (trade name MEDG manufactured by Nippon Emulsifier Co., Ltd.)
Diethylene glycol diethyl ether (trade name DEDG manufactured by Nippon Emulsifier Co., Ltd.)
Triethylene glycol monobutyl ether (trade name, Triethylen Glycol Monobutyl Ether, manufactured by Tokyo Chemical Industry Co., Ltd.)
Tetraethylene glycol monobutyl ether (trade name Butisenol 40, manufactured by KH Neochem)
Dipropylene glycol monomethyl ether (trade name Dipropylene Glycol Monomethyl Ether, manufactured by Tokyo Chemical Industry Co., Ltd.)
γ-Butyrolactone (trade name γ-Butyrolactone, manufactured by Tokyo Chemical Industry Co., Ltd.)
δ-valerolactone (trade name δ-Valerolactone, manufactured by Tokyo Chemical Industry Co., Ltd.)
Methyl caprylate (trade name Methyl n-Octanoate, manufactured by Tokyo Chemical Industry Co., Ltd.)
Methyl capanoate (trade name Methyl Decanoate, manufactured by Tokyo Chemical Industry Co., Ltd.)
3-methoxybutyl acetate (trade name 3-methoxybutyl acetate, manufactured by Daicel Corporation)
3-methoxy-3-methyl-1-butyl acetate (Kuraray Co., Ltd., trade name Solfit AC)
〔resin〕
Solvain CL (copolymer resin of vinyl chloride and vinyl acetate, trade name manufactured by Nissin Chemical Industry Co., Ltd.)
(Pigment dispersant)
Solsperse 37500 (trade name manufactured by Lubrizol)
[Surfactant]
BYK-340 (BIC Chemie Japan product name)

[Preparation of non-aqueous composition]
Each material was mixed with the composition shown in the following Table 1 and Table 2, and stirred sufficiently to obtain each non-aqueous composition. In Tables 1 and 2 below, the unit of numerical values for the materials used is mass%, and the total excluding the water content is 100.0 mass%. In addition, the content of each inorganic metal in each non-aqueous composition was adjusted to the numerical values shown in Tables 1 and 2 by the method described in “(Physical property 1) Content of inorganic metal” below.

(Physical property 1) Content of inorganic metal About 100 parts by mass of the non-aqueous composition in Example 1 in Table 1, 0.1 parts by mass of powder ion exchange resin IXE-6107 (manufactured by Toagosei Co., Ltd.) was added, and 100 rpm was added. For 60 minutes. Thereafter, the mixture was centrifuged at 20000 G for 10 minutes, and further filtered with a 3 μm membrane filter. After the filter treatment, the content of each inorganic metal was measured using an ICP emission spectroscopic analysis method (ICP emission spectroscopic analyzer, manufactured by Hitachi High-Tech). Table 1 shows the measurement results of three types (sodium, potassium, and calcium) in the order of the number of inorganic metal species having a large content. Furthermore, the same operation as described above was performed except that the stirring time was changed from 10 minutes so as to obtain the measurement results in Examples and Comparative Examples in Tables 1 and 2. The unit of numerical values is ppm by mass.

[Preparation of recorded material]
A vinyl chloride medium (3M, model number “IJ180-10”), which is a recording medium, is carried into an inkjet printer (trade name “SC-S30650”, manufactured by Seiko Epson), and obtained in Examples and Comparative Examples in the discharge head. Each of the compositions thus prepared was filled, and the temperature of the platen was maintained at 45 ° C. during the preparation of the recorded matter and for 1 minute after the preparation of the recorded matter, at a coating amount of 10 mg / inch ^{2 and} at a target resolution of 720 × 720 dpi. Thus, a solid pattern was prepared and each recorded matter was obtained. In addition, even if there was a portion where the ejection was insufficient due to ejection failure, no operation was made to compensate for the failure.

(Evaluation 1) Storage stability Each non-aqueous composition obtained in Examples and Comparative Examples was accommodated in an ink container of an ink jet printer (trade name “SC-S30650” manufactured by Seiko Epson Corporation), and the composition was 7 at 60 ° C. After the daily acceleration test, the viscosity of the non-aqueous composition at 20 ° C. is measured to determine the viscosity increase ratio (ink viscosity at 20 ° C. after the acceleration test / ink viscosity at 20 ° C. before the acceleration test × 100). The storage stability was evaluated according to the following evaluation criteria. The obtained results are shown in Tables 1 and 2. The viscosity of the non-aqueous composition at 20 ° C. was measured with a viscometer (trade name “MCR-300” manufactured by Physica) using a cone (diameter 75 mm, angle 1 °) at a rotation speed of 100 rpm.
(Evaluation criteria)
○: Thickening rate is less than 1% and there is no crystalline foreign matter △: Thickening rate is 1% or more and less than 3% and there is no crystalline foreign matter Δ △: Thickening The rate is 3% or more and less than 4%, and there is no visually foreign matter. X: The thickening rate is more than 4%, or less than 4% and visually foreign matter is present.

(Evaluation 2) Saturation Saturation (C ^* ) was evaluated for each recorded matter obtained. Specifically, for each recorded matter obtained, colorimetry of a * value b * value was performed using Spectrolino (manufactured by Gretag Macbeth), C * was calculated, and saturation was evaluated according to the following evaluation criteria. did. In addition, the value of C * was rounded off the decimal point of the calculated value of C * to obtain an integer value. The obtained results are shown in Tables 1 and 2.
(Evaluation criteria)
○: C ^* value is 110 or more Δ: C ^* value is 100 or more and less than 110 ΔΔ: C ^* value is 90 or more and less than 100 ×: C ^* value is 89 or less

(Evaluation 3) Manufacturing cost From the stirring time when adjusting the content of the inorganic metal in each non-aqueous composition, the manufacturing cost was evaluated according to the following evaluation criteria. The obtained results are shown in Tables 1 and 2.
(Evaluation criteria)
A: The stirring time is 0 minute or more and less than 30 minutes.
Δ: The stirring time is 30 minutes or more and less than 2 hours.
X: The stirring time is 2 hours or more.

  From the comparison of Examples and Comparative Examples shown in Tables 1 and 2, it was found that the non-aqueous ink jet composition according to the present invention can provide recorded matter with excellent saturation. Furthermore, it was found that the non-aqueous ink jet composition is excellent in storage stability. Moreover, it turned out that it is excellent also in the cost which manufactures the said non-aqueous inkjet composition.

  DESCRIPTION OF SYMBOLS 1 ... Printer, 2 ... Inkjet recording head, 3 ... Ink cartridge, 4 ... Carriage, 5 ... Platen, 6 ... Recording medium, 7 ... Carriage moving mechanism, 8 ... Medium feed mechanism, 70 ... Ink pack, 72 ... Cartridge Case, 74 ... Ink supply port, 76 ... Main body case, 78 ... Cover

Claims (10)

A non-aqueous inkjet composition comprising a pigment containing a diketopyrrolopyrrole pigment, an organic solvent, and an inorganic metal,
The organic solvent contains glycol ethers,
The inorganic metal contains at least one of an alkali metal and an alkaline earth metal,
Among the alkali metal and the alkaline earth metal, the content of the first inorganic metal having the largest content in the non-aqueous inkjet composition is 100 mass ppm or less with respect to the total amount of the non-aqueous inkjet composition. Is,
Non-aqueous inkjet composition.   Among the alkali metal and the alkaline earth metal, the content of the second inorganic metal having the second largest content after the first inorganic metal in the non-aqueous inkjet composition is the total amount of the non-aqueous inkjet composition. On the other hand, the non-aqueous inkjet composition of Claim 1 which is less than 100 mass ppm. The first inorganic metal is at least one of sodium, potassium, and calcium;
The non-aqueous inkjet composition according to claim 1 or 2. The non-aqueous inkjet composition according to any one of claims 1 to 3, wherein the glycol ether contains a glycol diether represented by the following formula (1).
R ¹ O— (R ³ O) _m —R ² (1)
(In the formula (1), R ¹ and R ² each independently represents an alkyl group having 1 to 7 carbon atoms, R ³ is an alkylene group having 1 to 3 carbon atoms, m is 1-7 Indicates an integer.) The non-aqueous inkjet composition according to any one of claims 1 to 4, wherein the glycol ether contains a glycol monoether represented by the following formula (2).
OH— (R ⁵ O) _n —R ⁴ (2)
(In formula (2), R ⁴ represents an alkyl group having 1 to 7 carbon atoms, R ⁵ represents an alkylene group having 1 to 3 carbon atoms, and n represents an integer of 1 to 7)   The non-aqueous inkjet according to any one of claims 1 to 5, wherein a content of the pigment is 1.0% by mass or more and 5.0% by mass or less with respect to a total amount of the non-aqueous inkjet composition. Composition.   The non-aqueous inkjet composition according to any one of claims 1 to 6, wherein a content of the glycol ether is 10% by mass or more and 90% by mass or less with respect to a total amount of the non-aqueous inkjet composition. .   The non-aqueous inkjet composition according to any one of claims 1 to 7, wherein the organic solvent further contains a cyclic lactone.   The non-aqueous inkjet composition according to any one of claims 1 to 8, further comprising a vinyl chloride resin.   The inkjet recording method which has a process of recording on a recording medium by the inkjet method using the non-aqueous inkjet composition as described in any one of Claims 1-9.

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